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Q: Fachverband Quantenoptik und Photonik
Q 60: Laser Applications I
Q 60.8: Vortrag
Freitag, 4. März 2016, 12:45–13:00, a310
Driving circular currents in super atomic molecular orbitals of fullerenes by light carrying orbital angular momentum — •Jonas Wätzel, Yaroslav Pavlyukh, Alexander Schäffer, and Jamal Berakdar — Institut für Physik, Martin-Luther Universität Halle-Wittenberg, Karl-Freiherr-von-Fritsch-Str. 3, 06120 Halle/Saale
Endohedral molecular magnets are promising candidates for molecular electronics and quantum information processing. For utilization an ultrafast control of the local magnetization is inevitable. We suggest exploiting in Fullerenes the virtual, (super) atomic-like molecular orbitals (SAMOs) to photo-trigger current loops and hence localized magnetic pulses for magnetization
An effective method to steer magnetism is to use inhomogeneous, light carrying orbital angular momentum (OAM). In principle in presence of spin-orbital coupling one may drive the spin directly with such a beam but here we generate surface orbital moment that Zeeman-couples to the well isolated spin active states associated with the endohedral structure.
We found that the generated current is controllable by the frequency, the topological charge, and the intensity of the light. Utilizing Numerical and analytic calculations we find that a UV OAM fs pulse with an intensity 1013 W/cm2 generates nA currents with an associated magnetic field on the scale of few hundreds µT in the centre of the fullerene.